The effort was announced last Wednesday by Jack Posobiec, a vocal Trump supporter and right-wing activist who is known for pushing the false “Pizzagate” conspiracy theory. After the white supremacist rally in Charlottesville, Virginia turned violent, March on Google released a post condemning and disavowing the violence and hatred, as well as all groups that espouse it.

On Wednesday, a post on March on Google’s website said it is postponing the march due to “credible Alt Left terrorist threats.”

Who the “alt-left” is has yet to be defined by anyone. Presumably in this context it refers to groups like Antifa who clashed with the alt-right white supremacists last weekend in Charlottesville, Virginia.

President Trump also used the term “alt-left” just one day earlier during a news conference. It equated white supremacist marchers, part of what is sometimes called the “alt-right,” in Charlottesville to counterprotesters. The term has also been pushed by Fox News Channel’s Sean Hannity. Oren Segal, director of the Anti-Defamation League’s Center on Extremism, called it a “made-up term” used to “suggest there is a similar movement on the left.”

March on Google claimed it received a threat to drive a car into the march. The specifics mirror what happened in Charlottesville on Saturday, when a car plowed through a crowd of counterprotester, killing Heather Heyer.

If it prevents another orgy of violence from taking place, the cancellation is a good thing.